ควอร์ไทล์ของรายได้

WITH user_revenues AS (
  -- Select the user IDs and their revenues
  SELECT
    ___,
    ___ AS revenue
  FROM meals AS m
  JOIN orders AS o ON m.meal_id = o.meal_id
  GROUP BY user_id)

SELECT
  -- Calculate the first, second, and third quartile
  ROUND(
    ___ :: ___,
  2) AS revenue_p25,
  ROUND(
    ___ :: ___,
  2) AS revenue_p50,
  ROUND(
    ___ :: ___,
  2) AS revenue_p75,
  -- Calculate the average
  ROUND(___ :: ___, 2) AS avg_revenue
FROM user_revenues;